Really simple TV set-up: Aerial on roof feeds in to Sky box RF in, then from Sky box RF2 out to multi-way distribution amplifier to lounge, kitchen plus 3 beds....
BUT since Sky Q box doesn't support RF at all then you can't do it this way. This is only possible with the older HD boxes that either have RF in/out or can use the i/o adapter. It's just like flameport said in this respect.
There are other ways of achieving what you want though.
1) Sky Q supports multi-room with the mini boxes that connect via wireless. You would need to upgrade your package to include muliti-room and possibly change your wireless router as well, but that would allow you to watch the same or a different channel in another room. See SKY for costs and options.
2) There's a device called a HD RF Modulator (approx £150-£200) that will take HDMI at both standard def and HD, and then blend that signal with Freeview from a roof/loft aerial and allow you to pipe the signal around the house. This will give you the normal Freeview channels plus one RF channel on the TV that carries the Sky box signal from the lounge. This signal is simply a window on what's being watyched in the lounge, so you
can't watch Sky Sports in one room and Sky movies in another.
To use the modulator you have to split the HDMI output from the Sky box 2 ways, then connect one to the local TV and one to the modulator. The aerial feed goes direct from the roof/loft aerial in to the modulator, and then from the modulator up to the multi-way distribution amp that feeds the other TVs. You'll also need some way of controlling the Sky box from the bedroom/kitchen. One simple solution is to use the Sky Control App from an Android or iOS smart phone connected to your home network.
3) HDMI balun. This is only really practical/cost-effective for one or possibly two rooms. What's involved is the same HDMI splitter, but this time the signal from the splitter output goes to a box with HDMI on one side and an Ethernet network socket on the other. From there an Ethernet cable is run to the remote location. At the far end a box converts the signal back in to HDMI. There are versions of these TX/RX balun kits that include IR relay back down to the Sky box. NOTE: Although this uses Ethernet connections the signals running through the cables are not compatible with the IP signals that are used for PC networking. Don't mix IP and HDMI balun signals; they're not compatible
The above aren't the only solutions, but they are probably the most commonly used where a HD signal is required in a remote location.
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